[Graham G3ZVT]

I have a 99k, it's mainly a display item but I keep it threaded and do occasionally use it.

The last time was to hem some curtains for the grandkids Wendy house in the garden. When I came back into the house from hanging them, the 99k was going full pelt stitching its own thread together!
The suppressor capacitor was nothing special, and was across the rheostat in the foot-pedal and had gone short circuit in the half hour or so when I was absent.

Moral of the story, don't leave vintage stuff plugged in unattended.